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간척지에서 질소비료 및 돈분 퇴비 시용에 따른 사탕무 (Beta vulgaris var. Aaron)의 수량 반응 해석을 위한 시비반응 모델 탐색
임우진(Woo-Jin Lim),손연규(Yeon-Kyu Sonn),윤영만(Young-Man Yoon) 한국토양비료학회 2010 한국토양비료학회지 Vol.43 No.2
본 연구에서는 사탕무의 시비반응을 합리적으로 해석하고 경제성 있는 최적 시비량 및 최대 수확량의 도출을 위한 방법을 검토하기 위하여 간척지 토양에서 수준별 질소비료와 돈분퇴비의 시용에 따른 사탕무의 시비반응을 조사하였다. 시비반응은 Quadratic model, Exponential model, Square root model 및 Linear response & plateau model을 이용하여 통계적으로 분석하였다. 토양 EC가 증가함에 따라 사탕무 지하부 생체중이 지수함수적으로 감소하였다. 질소비료 시비수준별 사탕무 지하부 생체량의 시비반응은 Linear response에서 결정계수 & plateau model (R²)가 0.92<SUP>**</SUP>로 고도의 통계적 유의성을 보였으며, Linear response & plateau model에서 최적 질소시비량 (Nopt)은 138 ㎏ ㏊?¹으로 나타났다. 돈분퇴비의 시비반응은 Quadratic model에서 0.99<SUP>**</SUP>의 유의성 있는 결정계수 (R²)를 보였으며, 최적 퇴비시비량은 각각 9.17 tons ㏊?¹으로 나타났다. 상기 결과로 볼 때 사탕무에서 질소와 돈분퇴비의 시비반응을 적절히 평가하기 위해서는 각각 Linear response & plateau model과Quadratic model을 이용하는 것이 합리적인 것으로 판단되었다. In order to interpret yield response of sugar beet to nitrogen fertilizer, and pig manure compost in saline-sodic soil of reclaimed tidal land, 4 kinds of response model, i.e., quadratic, exponential, square root, and linear response, and plateau model, are applied. The root fresh yield of sugar beet decreased exponentially with the increase of soil EC. The root fresh yield of sugar beet to nitrogen fertilizer was fitted best to the linear response, and plateau model among 4 yield response models with highly significant determination coefficient (R²=0.92<SUP>**</SUP>). The optimum N rate determined on the model was 138 ㎏ N ㏊?¹. The root fresh yield of sugar beet to pig manure compost was fitted best to the quadratic model among 4 yield response models with highly significant determination coefficient (R²=0.99<SUP>**</SUP>). The maximum N rate determined on the model was 9.17 ton ㏊?¹. In conclusion, the proper model to interpret the yield of sugar beet in saline-sodic soil differs with the kinds of nutrient, linear response, and plateau model for fertilizer nitrogen, and quadratic model to pig manure compost.
임우진(Lim Woojin) 문학과환경학회 2005 문학과 환경 Vol.4 No.-
This paper aims to define "wilderness," or nature of the 17th century America and take account of its development. The New England puritans in The 17th century considered their nature or environment as different from that of contemporary Europeans. They interpreted it in terms of their religious doctrine(Puritanism) and their own experiences and coined wilderness which was an allusion from the Bible. So, for them, nature was not only the basic source of economical wealth but also the basis of their religious life. Especially, the early 17th century puritans, including William Bradford or John Winthrop considered their nature as a haven or refuge from Old World's moral depravity. Furthermore, they thought and believed that their physical and psychological hardships in the New Worlds were just God's testing of themselves ― a necessary prelude to everlasting salvation.<br/> During the latter half of the 17th century, coping with new changing social situations, they added a new interpretation to wilderness. It was emphasized on as a testing place for their faith through their "jeremiads" in which puritan divines warned God's anger against their increasing pursuit of economical wealth and physical pleasure. Newly emerging "Indian Captivity Narratives" played an important role in restoring their faith and maintaining New England as a firm religious community. They could confirm God's anger and grace in Indian captivity narratives and wilderness as His tribulation. However, in Indian captivity narratives, wilderness and Indians in it played an important part like a kind of converter. Wilderness converted Europeans into new Americans. In it they could form their own identities fitted into the newly founded community.<br/> In this context, for Americans, wilderness or nature is neither the object of economical exploitation nor aesthetical contemplation. Americans have given some unique sense to their nature: for them, it is the place of religious worship and the place creating their American ego. It is in this sense that nature or environment is very important in studying American literature such as Cooper's, Hawthorne's, Transcendentalists', and Twain's.